Dynamo- and electro-optical properties of polypeptide molecules in helical- and coil (skein-like) conformations

Tsvetkov, V.N.; Shtennikova, I.N.; Ryumtsev, Ye.I.; Pirogova, G.F.

doi:10.1016/0032-3950(67)90421-2

Cited by 11 publications

(4 citation statements)

References 13 publications

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“…The stress-optical coefficient of a long flexible PBLG with L ≫ L P was estimated to be C ∞ ∼ 6 C L L P /5 = 3.8 × 10 –7 Pa –1 at –25 °C (see Supporting Information). The temperature-reduced coefficient, C ∞ T, is evaluated as C ∞ T = 9.4 × 10 –5 K Pa –1 , and this value is in accord with the reported value, C ∞ T = 1.6 × 10 –4 K Pa –1 in dichlorethane at 25 °C …”

Section: Resultssupporting

confidence: 82%

Linear Viscoelasticity and Birefringence of Poly-γ-Benzyl-l-Glutamate Solutions

2021

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The complex modulus and the strain-optical coefficient for two samples of poly-γ-benzyl-L-glutamate in m-cresol solution were measured over a wide concentration regime covering from a dilute to tightly entangled region. The obtained experimental data in the dilute region were compared with the theory by Morse and coworkers for dilute solutions, which predicts three relaxation modes, tension, curvature, and orientation. We found that the theory well described the complex modulus of dilute solutions. With increasing the concentration, the three relaxation modes retarded, due to the hydrodynamic interaction. In addition, the topological interaction also retarded the orientation mode. The complex modulus of the tightly entangled region was separated into the component moduli using the strain-optical coefficient and the molecular theory. The curvature stress contributed to the rubbery plateau modulus in the tightly entangled region, as predicted by the Morse theory for the entangled systems. However, the relaxation time of curvature stress was shorter than the theoretical prediction, which is based on the fixed tube model. We speculate that the constraint release accelerates the relaxation of curvature stress but has a little effect on orientational stress.

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Section: Resultssupporting

confidence: 82%

Linear Viscoelasticity and Birefringence of Poly-γ-Benzyl-l-Glutamate Solutions

2021

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“…It is to be noted that the initial drop of the former is sharper than that of the latter. This result is not in agreement with that of Tsvetkov et al (5). Thus, the remarkably abrupt decrease of the specific Kerr constant of PBLG upon the first addition of DCA is related to the diminution of the apparent permanent dipole moment, rather than to that of the optical anisotropy factor.…”

Section: Steady-state Electric Birefringencecontrasting

confidence: 52%

“…Subsequently, Tsvetkov et al (5) studied the streaming birefringence, the electric birefringence and the reduced viscosity of PBLG in EDC-DCA mixtures. In order to prevent aggregation, EDC containing 2% dimethylformamide (DMF) was used.…”

Section: Introductionmentioning

confidence: 99%

The effect of dichloroacetic acid on the electric and hydrodynamic properties of poly-γ-benzyl-L-glutamate in solution

Ohe

Yoshioka

1974

Colloid Polymer Sci

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“…In [72][73][74], the electro optical properties and dynamics of the orientation of poly(γ benzyl L glutamate) (PBG) molecules in organic solvents were examined. A pronounced equilibrium rigidity of PBG molecules in the helical conformation, which is responsible for a high value of Kerr constant К of the polymer, sharply declines after the transition of mac romolecules from the helical conformation to the coil conformation.…”

Section: Electric Birefringence In Solutions Of Polypeptides and Theimentioning

confidence: 99%

Electro-optics of solutions of biopolymers and their complexes

Лезов

Polushina

2012

Polym. Sci. Ser. A

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The review summarizes the results of electric birefringence studies of the molecular properties of biopolymers and their complexes. The application of alternating electric fields makes it possible to study the kinetics of orientation of DNA, RNA, and polypeptide molecules in diluted solutions. An analysis of molec ular mass dependences of relaxation times of biopolymer molecules in terms of the rotational friction theory is used to determine the equilibrium rigidity of macromolecules characterized by Kuhn segment length A. For DNA molecules in buffer solutions with a low ionic strength, the value of A derived from electro optical mea surements is 114 nm. The high sensitivity of electric birefringence to changes in the secondary and tertiary structures of biopolymers ensures its use for the analysis of sequence curvature in short fragments of DNA and for investigation of transitions between different tertiary structures of RNA. The study of electro optical bire fringence in solutions of complexes of DNA and polypeptides with oppositely charged ions of surfactants makes it possible to gain insight into their conformational properties in organic solvents. The stoichiometric complexes of DNA in chloroform occur in the compact globular state, whereas the conformation of com plexes formed by various polypeptides depends on their composition and may vary from rodlike to coiled. Electric birefringence in solutions of biopolymer complexes is associated with the orientation of molecules that is due to the external field induced dipole moment that appears as a result of a small displacement of ions along the contour of polyion chains. The time of reaching the induced dipole moment is equal to or greater than the time of orientational relaxation of the complex as a whole.

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Dynamo- and electro-optical properties of polypeptide molecules in helical- and coil (skein-like) conformations

Cited by 11 publications

References 13 publications

Linear Viscoelasticity and Birefringence of Poly-γ-Benzyl-l-Glutamate Solutions

Linear Viscoelasticity and Birefringence of Poly-γ-Benzyl-l-Glutamate Solutions

The effect of dichloroacetic acid on the electric and hydrodynamic properties of poly-γ-benzyl-L-glutamate in solution

Electro-optics of solutions of biopolymers and their complexes

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